What is Tony Stark's robot called?

Excuse me, but I'm a bit curious. I've been hearing a lot about Tony Stark and his incredible technological achievements. I understand he has a robot that assists him in his endeavors. Now, I know this might be a simple question, but I can't seem to recall the name of this remarkable robot. Could you possibly enlighten me on what Tony Stark's robot is called? I'm quite eager to learn more about it.